Needs 21 km run

I just wish there was training for half marathons(21 km) on here. I love this training but its only limited to 2 different runs. It definitely needs a 21 km run trainer. Other than that I like this app.

LorealWild1 about Strong Runner - Personal Running Trainer App for 5K and 10K Plans- Warm-up, Strenght and Stretching Video Workout Training Program for Runners, v2.4.1